28928365788 has 72 divisors (see below), whose sum is σ = 80642068752. Its totient is φ = 8041856256.

The previous prime is 28928365787. The next prime is 28928365841. The reversal of 28928365788 is 88756382982.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28928365787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 643081 + ... + 686592.

Almost surely, 2^28928365788 is an apocalyptic number.

28928365788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28928365788 is an abundant number, since it is smaller than the sum of its proper divisors (51713702964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28928365788 is a wasteful number, since it uses less digits than its factorization.

28928365788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329731 (or 1329722 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 66.

It can be divided in two parts, 28928 and 365788, that added together give a triangular number (394716 = T₈₈₈).

The spelling of 28928365788 in words is "twenty-eight billion, nine hundred twenty-eight million, three hundred sixty-five thousand, seven hundred eighty-eight".